It says demo mode and there is no heat, everything else works

set reset

If everything works on the unit, but you do not receive any heat or possibly the turntable does not turn you have a faulty magnetron (controls heat) and a faulty motor (controls turntable). You would require service on the unit, if parts are available. Some microwaves are so small in cubic foot size, that manufacturer's do not have parts available for purchase/repairs.

Is this a USA made uint.

Demo Mode The Demo Mode is ideal for learning how to use the microwave oven. When set, functions can be entered without actually turning on the magnetron. The microwave oven light will come on, the fan will run, the countdown will run very quickly in the display, and the turntable will rotate. To Turn On/Off: The microwave oven and Timer must be off. Touch and hold TIMER SET/OFF for 5 seconds until 1 tone sounds. Repeat to turn off.

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

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Hello Keith Sprague,

Spelling is close and your guess is quite excellent...

Before you ENGAGE in a wholesale repair effort...

You should check your machine is not in DEMO mode...

Demo Mode
Activate to practice using the control without actually turning on
the magnetron. Touch and hold number pad "3" for 3 seconds. The
"DEMO" icon will appear in the display. Repeat to exit Demo Mode

From page 3 (of your operators manual)

Whirlpool MH2175XSB User Instructions Electrical Requirements

Hope this helps


Carnac the Magnificent

Most likely you have a magnetron problem. Easy to replace (DYI) but make sure the high voltage capacitor is fully discharged first against the case.

The fact that the microwave and convection both do not heat indicated that the oven is in demo mode, check the user manual, otherwise it will possibly be a relay not triggering, may need a pcb replacement, check Demo mode 1st....Phil

It sounds like you have a microswitch that is bad or out of alignment.

Does the turntable rotate? If everything but this works (except no heat), you probably have a bad door switch. Here's a discussion of what's involved in replacing it: http://www.fixya.com/support/t267796-kenmore_microwave_hood_combination_over

If the turntable does rotate, I'd suspect a more significant failure, such as the transformer, capacitor, or magnetron. If it's any of these, it's time to replace the unit.